Compilare: user.cpp: In function ‘int main()’: user.cpp:78:34: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[25]’ [-Wformat=] while(scanf("%d %s\n", &t, &W) != EOF) { ^ user.cpp:71:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in", "r", stdin); ^ user.cpp:72:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out", "w", stdout); ^